/**
 * This file is part of aion-emu <aion-emu.com>.
 *
 *  aion-emu is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  aion-emu is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.aionengine.gameserver.network.loginserver;

import com.aionemu.commons.network.packet.BaseServerPacket;

import java.nio.ByteBuffer;

/**
 * Base class for every GameServer -> Login Server Packet.
 *
 * @author -Nemesiss-
 */
public abstract class LsServerPacket extends BaseServerPacket {

    /**
     * constructs new server packet with specified opcode.
     *
     * @param opcode packet id
     */
    protected LsServerPacket(int opcode) {
        super(opcode);
    }

    /**
     * Write this packet data for given connection, to given buffer.
     *
     * @param con
     * @param buf
     */
    public final void write(LoginServerConnection con, ByteBuffer buffer) {
        setBuf(buffer);
        buf.putShort((short) 0);
        buf.put((byte) this.getOpcode());
        writeImpl(con);
        buf.flip();
        buf.putShort((short) buf.limit());
        buf.position(0);
    }

    /**
     * Write data that this packet represents to given byte buffer.
     *
     * @param con
     * @param buf
     */
    protected abstract void writeImpl(LoginServerConnection con);
}
